Hi @FilterSquad, welcome - our first post from South Dakota I believe.
$24,500 is a lot of money to spend on a 5kW system, even if it does have batteries.
Can I please clarify a couple of things? What is the reason you are wanting batteries? Is it energy independence, or financial reasons? The reason I ask is that it is very unlikely to be financially worth while.
Also, when you say your usage is “4Kw” - do you mean 4kWh per day? Might be worth reading this post to get clear on your needs: